An authentic dry sauna, also known as a bona sauna, with the sauna heater built into the space beneath the seating. Because the heat source is not exposed, the room temperature and humidity stay even, making it less likely to feel stuffy. The gentle warmth that rises from the bench slowly and steadily warms the body from the core, while still feeling kind to the body. Enjoy a relaxing session amid the warmth of wood and calm background music, and experience a deeply satisfying sweat.

A moisture-rich aroma mist sauna that softly fills the room with fine, low-temperature mist. The gentle fragrance of aroma helps relax the mind, and by breathing deeply and inhaling the mist, you can refresh yourself from within. This meditative space is highly recommended for those who are not fond of the intense heat of high-temperature saunas, or for anyone who wants to warm up slowly and thoroughly while giving the skin plenty of moisture.

A cold plunge bath located inside the large public bath, right near the sauna and aroma mist sauna. It has a crisp coolness that quickly cools down a body warmed to the limit in the sauna, yet the water temperature is kept at an exquisite level that feels refreshing without being too cold. Its mild texture surrounds the whole body, creating an invigorating sense of refreshment. After the cold plunge, you can enjoy the best outdoor air bath while feeling Hakodate’s pleasant sea breeze in the “Onsen Living” area, whose modern design stands out in the open-air section.